It is not so simple to explain in few words; see the link below.
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In order to determine the number of significant figures in a number, you need to look at the non-zero digits and any zeros between them.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Three - all nonzero numbers are significant.
3 significant figures.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.